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Before I start my review, I would like to Thank Westone for providing me with UM56 review sample (while audiologist impressions were covered by me) in exchange for my honest opinion.
http://www.westoneaudio.com/index.php/products/custom-series/um56.html
As I have mentioned in most of my IEM reviews, eartips selection plays the most crucial role in getting the best sound out of your...” --twister6

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http://www.head-fi.org/forum/thread/552996/review-westone-ac2-dual-driver-custom-in-ear-monitor
See above for my in depth review. In general, the Westone AC2 is a great addition to the somewhat crowded entry level custom IEM market. It has its own flavor that will surely please some people. What would be the point if Westone just released another UE4pro/LiveWires sounding custom,...” --project86

A great entry level in-ear musicians' monitor, the ES1 contains one full range speaker in each ear and delivers incredible clarity and punch.
Recommended for solo vocalists who may be singing to backing tracks, or vocalist/acoustic guitar players. The ES1 is not recommended for drummers or bassists, as it not designed to handle the low end response that is necessary for those...

Stepping up to a fully custom in-ear musician monitor has never been easier than with the AC1. Whether youÕre a seasoned performer, emerging artist or listening enthusiast, WestoneÕs custom-fit technology, cold pour acrylic body, single balanced armature driver, removable EPIC Pro cable all deliver serious value. The AC1 is available only in clear, full acrylic, with Westone...

Custom made to provide a precise, comfortable fit, the dual driver Westone ES2 provides exceptional low frequency response, smooth mids and articulate highs. Our most popular and versatile custom monitor, the ES2 is designed for the most discriminating artists.